Sharp UX-300 - Manual (Page 63)

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Hold
You can put the other party on hold during a conversation by pressing
the HOLD/SEARCH key. When this is done, they cannot hear you.
You can put the handset back in the cradle without breaking the
connection. When you are ready to speak with them again, pick up the
handset. If you did not put the handset back in the cradle, press the
HOLD/SEARCH key again to resume conversation.
5.
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Making Telephone Calls
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